With the Supreme Court poised to decide the future, if any, of Chevron deference, I hesitated to provide a discussion of a current decision on deference. Still, I thought it would be helpful to do so because the case discussed in this blog involves the application of Chevron deference to agency adjudications which differ materially from the current cases before the Supreme Court involving agency rulemaking. The context for this blog entry is retroactivity in agency adjudicative interpretation which has different features than agency rulemaking interpretation. (That is not to say that whatever the Supreme Court does will not affect appellate review of agency interpretations in adjudications.)
As an aside, I do wonder why courts, such as the Second Circuit in the case prompting this blog entry, are deciding cases on the basis of Chevron deference, rather than postponing them for decision when the current Supreme Court challenges are resolved (probably by the end of May).
As an introduction to today’s discussion, I think it helpful to state the material differences between agency rulemaking and agency adjudications as respects interpretation and retroactive application. In this introduction, I state general propositions in most cases without citations. All of the subjects are covered in my prior article, The Report of the Death of the Interpretive Regulation Is an Exaggeration (last revised 4/8/22), posted on SSRN, here.
In this discussion, I will refer to Chevron deference as the applicable benchmark, but as I have previously discussed, deference to agency interpretations with the key features of Chevron deference was applied long before Chevron. Those key features of are—(i) ambiguity in the statutory text; and (ii) reasonable agency interpretation within the scope of the ambiguity. Supreme Court opinions prior to Chevron stated deference in those terms. See The Tax Contribution to Deference and APA § 706 (December 14, 2023 SSRN 4665227), here.
Agency rulemaking
If the rule is legislative in character, the rule must be promulgated in a notice and comment regulation. The only exception is when the legislative rule is accompanied by a “good cause” statement as to why it should be immediately effective when first promulgated (called an interim final rule in general administrative law jargon and a temporary regulation in tax jargon). The general rule is that, without explicit statutory authority for retroactivity, legislative rules cannot be retroactive prior to the date of promulgation of the rule. (This parallels the general rule that legislation cannot be retroactive.) Legislative rules being the law rather than interpretations of the law are not susceptible to Chevron deference, which tests the reasonableness of an interpretation within the scope of ambiguity in the statutory text. (The statement made by many pundits and even courts that Chevron deference applies to legislative regulations or only to legislative regulations is an oxymoron; making such statements, even by pundits or courts, does not make them true.)
If the rule is interpretive in character, the general rule is that a valid interpretation can be retroactive to the date of enactment of the statute. The concept is that the interpretation merely clarifies an ambiguity in the statutory text within its reasonable scope of interpretation from the date of enactment; the application of the interpretation does not offend due process since all persons to whom the law could apply were on notice that some interpretation of the ambiguous statutory text may be forthcoming; in other words, they did not reasonably rely upon some alternative interpretation. This is the same rule that applies generally to court interpretations of statutes—retroactivity to the date of enactment of the statute.